空间多点地震激励下桥梁结构非线性碰撞机理及减震研究

项目名称： 空间多点地震激励下桥梁结构非线性碰撞机理及减震研究

项目编号： No.51278163

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 任伟新

作者单位： 合肥工业大学

项目金额： 80万元

中文摘要： 碰撞导致的落梁是桥梁地震最严重的破坏形式之一。由于地震的随机性和突发性，地震作用下桥梁结构碰撞机理异常复杂，需要考虑空间多维多点地震激励以及三维和非线性碰撞分析，然而相关的理论和实验研究还不多。项目从理论、数值模拟和试验三个方面，对桥梁结构在空间多维多点地震激励下的非线性碰撞机理及减震技术进行深入研究，旨在解决能同时考虑行波效应、部分相干效应及局部场地效应的空间多维多点地震动的合成技术；建立能考虑相邻桥跨之间面－面碰撞、偏心碰撞和混凝土冲击非线性的三维碰撞分析模型；进行空间多维多点地震激励下桥梁结构碰撞地震台实验，根据试验结果验证数值分析模型；展开三维和非线性碰撞响应计算和参数分析，搞清桥梁结构地震碰撞破坏机理；在此基础上研究不同减震装置对桥梁结构碰撞效应的影响，联合采用模数式伸缩缝及限位器，并给出相应准则，指导桥梁结构碰撞减震防灾设计。项目研究具有较大的理论意义和工程实用价值。

中文关键词： 多点地震激励；碰撞；地震响应；三维有限元分析；振动台试验

英文摘要： The beam falling due to pounding is one of the extreme bridge failure modes during the earthquake. As the earthquake is stochastic and unforeseen, the beam pounding mechanisim is very complex so that the spatial seismic input and three-dimensioanl nonlinear analysis should be included in the pounding analysis. Unfortunately, the related theory and experiments are lack.This project is aimed at investiagteing the nonlinear pounding mechanisim and pounding migitation of bridge superstructures under spatial and multi-point earthquake excitations by means of theory, numerical simulation and lab experiment. It is intended to solve the spatial and multi-point seismic wave combination that can include the time delay, partial coherence and site effect and to establish the three-dimension pounding analysis model that can consider face-face pounding, encentric pounding and impact properties of concrete. The propect proposes the shake table tests of bridge pounding under spatial and multi-point seismic excitation in the laboratory. The experimental results will be used to verify the analytical model. With that verified analytical (fifnite element) model, the three-dimensional and nonlinear pounding response analysis and corresponding parametric studies can be carried out to figure out the bridge pounding failure mechanisim.

英文关键词： spatially varying ground motion；pounding；seismic response；3D finite element modeling；shake table test